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sinus infection
Sinusitis is an inflammation or swelling of the tissue lining the sinuses. Healthy sinuses are filled with air. But when they become blocked and filled with fluid, germs can grow and cause an infection.
Conditions that can cause sinus blockage include:
The common cold
Allergic rhinitis, which is swelling of the lining of the nose
Small growths in the lining of the nose called nasal polyps
A deviated septum, which is a shift in the nasal cavity
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